Are you sure you use CD2 from the same set? Usually CDs are
coming in a different "series", for example, "OS 2000.2.4", "OS
2000.2.5", OS 2000.4.4", etc., and some boxes contain more than
one "set". Just sort them by the description, and remove all you
don't need.

I already copy both DCs in to one CD and also still asking me about the second dc.
but I'm worred about the cd extation as it has (CiscoCM.CD2) and it is Unknow application .to which application or ex. must be or can I convert into, sorry for my english.